Facile synthesis of three-dimensional spherical Ni(OH)2/NiCo2O4 heterojunctions as efficient bifunctional electrocatalysts for water splitting |
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| Affiliation: | 1. College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, The Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Normal University, Wuhu, 241002, PR China;2. Jiangsu Key Laboratory of Materials and Technology for Energy Conversion College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;1. School of Chemical Engineering and Technology, North University of China, Xueyuan Road 3, Taiyuan 030051, People’s Republic of China;2. School of Science, North University of China, Xueyuan Road 3, Taiyuan 030051, People’s Republic of China;1. Beijing Key Laboratory for Green Catalysis Separation, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, No. 100, Ping Le Yuan, Chaoyang District, Beijing, 100124, PR China;2. FG Werkstoffe der Elektrotechnik, Institut für Werkstofftechnik und Institut für Mikro- und Nanotechnologien MacroNano®, TU Ilmenau, Gustav-Kirchhoff-Str. 5, 98693, Ilmenau, Germany;3. FG Elektrochemie und Galvanotechnik, Institut für Werkstofftechnik und Institut für Mikro- und Nanotechnologien MacroNano®, TU Ilmenau, Gustav-Kirchhoff-Str. 6, 98693, Ilmenau, Germany;4. College of Materials Science and Engineering, Beijing University of Technology, No. 100, Ping Le Yuan, Chaoyang District, Beijing, 100124, PR China;1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China;2. The Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 100084, China |
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| Abstract: | Synthesis of highly efficient, non-noble and bi-functional electrocatalysts is exceedingly challenging and necessary for water splitting devices. In this work, three-dimensional spherical Ni(OH)2/NiCo2O4 heterojunctions are prepared by a one-step hydrothermal method and the hybrids are explored as efficient electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline electrolyte via tuning different Ni/Co atomic ratios of heterojunctions. The optimized Ni(OH)2/NiCo2O4 (S (1:1)) exhibits high electrocatalytic activity with an ultralow over-potential of 189 mV at 10 mA cm?2 for the HER. With regard to the OER, the over-potential of the as-synthesized S (1:1) heterojunction is only 224 mV at the current density of 10 mA cm?2. The improved catalytic performance of the Ni(OH)2/NiCo2O4 heterojunctions is attributed to the chemical synergic combining of Ni(OH)2 and NiCo2O4, large specific surface area for exposing more accessible active sites, and heterointerface for activating the intermediates that facilitates electron/electrolyte transport. The prepared catalyst exhibits good durability and stability in HER and OER catalyzing conditions. This study provides a feasible approach for the building of highly efficient bifunctional water splitting electrocatalysts and stimulates the development of renewable energy conversion and storage devices. |
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| Keywords: | Electrocatalysis Heterojunction Water splitting Bifunctional electrocatalyst |
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